Making plaster of Paris Molds

Discussion in 'HO Scale Model Trains' started by Prof1000, Jan 6, 2008.

  1. Prof1000

    Prof1000 New Member

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    Hi I have a black rubber mold that I fill with plaster of paris to make rocks for mountains. The problem is I have trouble at times getting it out of the mold without it cracking. Any one have any suggestions for making this job easier. Thanks in advance.

    Brian
  2. yellowlynn

    yellowlynn Member

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    molds

    I generally use a spray of soapy water, just to get it wet, then pour the POP. It works for me. I have even used WD-40, very light coating. Make sure the mold is clean before you pour. Lots of luck.

    Lynn
  3. GN.2-6-8-0

    GN.2-6-8-0 Member

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    Hydrocal or sculptamold ,either are a better product to use than plaster of paris. their stronger and dry slower making them much easier to work with.